Sumitomo Toughened front Glass windshield A3 Thickness: 5mm. Size: produced as per request. Quality as CE standardToughened Glass is made by heating flat glass to just below its softening temperature and suddenly chilling it with jets of cold air. It results in the outer skins under powerful compressive stress and the interior with severe tensile stress. In consequence, the impact applied to the glass will be overcome by the compressional stress on the surfaces to assure safety of use.FEATURES:1) 5 times harder than ordinary float glass. 2) Once breakage occurs, the glass disintegrates into small cubical fragments, which are relatively harmless to human body. 3) It withstands abrupt temperature change of 220 Centigrade. 4) Sizes are produced as per customer request. Once tempered, can not be cut down.